HomeMy WebLinkAboutProject Information (2)ST. LUCIE WORKS
Section E (Tile Calculations)
For Moment based tile systems, choose either Method 1 or 2. Compare the values for Mr with the values from Mf. If the Mf values
are greater than or equal to the Mrvalues, for each area of the roof, then the tile attachment method is acceptable.
Method 1'Moment Based Tile Calculations Per RAS 12T
(Zone 1:
,x 1L
= -_) -- Mg:
= Md,
(Zone 2e:
_.x7L
= _�-Mg;
=Mf
(Zone 2n:
x;L
= _) - Mg:
= Ma„
(Zone 2r:
x.
_ _) - Mg:
= M&
(Zone 3e:
x;L
_ _)-Mg:
=Ma.
(Zone3r:
x-
_ -J-Mg! .
=Ma,
Product Approval Mi
Product Approval Mf
Product Approval Mf
Product Approval Mf
Product Approval Mf
Product Approval Mf
Method 2 "Simplified Tile Calculations Per Table Below"
Required Moment of Resistance (Mr) From Table Below Product Approval Mf
Mr required Moment Resistance*
Mean Roof Height Roof Slope
15,
20'
25'
30'
40'
2:12
34.4
36.5
38.2
39.7
42.2
3:12
32.2
34.4
36.0
37.4
39.8
4:12
30.4
32.2
33.8
35.1
37.3
5:12
28.4
30.1
31.6
32.8
34.9
6:12
26.4
28.0
29.4
30.5
32.4
7:12
24.4
25.9
27.1
28.2
30.0
*Must be used in conjunction with a list of moment based the systems
• For Uplift based tile systems use Method 3. Compare the values for F' with the values for Fr If the F' values are greater than or
equal to the Fr values, for each area of the roof, then the tile attachment method is acceptable.
Method 3 "Uplift Based Tile Calculations Per RAS 12T
(Zone 1:
x L
=x W:= ) -W:
cos r
=Fri
(Zone 2e:
x L
=x W:=) -W:
cos r
=F02e
(Zone 2n:
x L
=x W:=) -W:
cos r
=Fr2n
(Zone 2r:
x L
=x W:=) -W:
cos r
=Fr2r
(Zone 3e:
x L
=x W:=) -W:
cos r
=Fr3e
(Zone 3r:
x L
=x W:= ) -W:
cos r
=Fr3r
Product Approval F',
Product Approval F'.
Product Approval F'.
Product Approval F'.
Product Approval F'.
Product Approval F'_
Where to Obtain Information
Description
Symbol
Where to find
Design Pressure
Zones 1, 2e, 2n, 2r, 3e, 3r
From applicable table in RAS 127 or by an engineering analysis
prepared by PE based on ASCE 7
Mean Roof Height
H
Job Site
Roof Slope
13
Job Site
Aerodynamic Multiplier
a
Product Approval
Restoring Moment due to Gravity
Mg
Product Approval
Attachment Resistance
Mf
Product Approval
Required Moment Resistance
Mg
Calculated
Minimum Attachment Resistance
F'
Product Approval
Required Uplift Resistance
Fr
Calculated
Average Tile Weight
W
Product Approval
Tile Dimensions
L = length W = width
Product Approval
All calculations must be submitted to the building official at the time of permit application.